Description Usage Arguments Details Value Author(s) See Also Examples
Identify pairs of cells that are adjacent.
1 |
x |
TransitionLayer |
Extracts the indices of those cells that are connected (e.g. cells i,j that have a non-zero value in the transition matrix).
Cell numbers are unique indices of cells in the original grid. By convention, cell numbers start with 1 in the upper-left corner of the grid and increase from left to right and from top to bottom.
A two column matrix with each row containing a pair of adjacent cells.
Jacob van Etten jacobvanetten@yahoo.com
adjacent
1 2 3 4 | r <- raster(nrows=6, ncols=7, xmn=0, xmx=7, ymn=0, ymx=6, crs="+proj=utm +units=m")
r[] <- runif(6*7)
T <- transition(r, function(x) 1/mean(x), 8)
adjacencyFromTransition(T)
|
Loading required package: raster
Loading required package: sp
Loading required package: igraph
Attaching package: 'igraph'
The following object is masked from 'package:raster':
union
The following objects are masked from 'package:stats':
decompose, spectrum
The following object is masked from 'package:base':
union
Loading required package: Matrix
Attaching package: 'gdistance'
The following object is masked from 'package:igraph':
normalize
NOTE: rgdal::checkCRSArgs: no proj_defs.dat in PROJ.4 shared files
NOTE: rgdal::checkCRSArgs: no proj_defs.dat in PROJ.4 shared files
[,1] [,2]
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[3,] 9 1
[4,] 1 2
[5,] 3 2
[6,] 8 2
[7,] 9 2
[8,] 10 2
[9,] 2 3
[10,] 4 3
[11,] 9 3
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[14,] 3 4
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[26,] 12 6
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[28,] 14 6
[29,] 6 7
[30,] 13 7
[31,] 14 7
[32,] 1 8
[33,] 2 8
[34,] 9 8
[35,] 15 8
[36,] 16 8
[37,] 1 9
[38,] 2 9
[39,] 3 9
[40,] 8 9
[41,] 10 9
[42,] 15 9
[43,] 16 9
[44,] 17 9
[45,] 2 10
[46,] 3 10
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[50,] 16 10
[51,] 17 10
[52,] 18 10
[53,] 3 11
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[57,] 12 11
[58,] 17 11
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[169,] 19 27
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[176,] 35 27
[177,] 20 28
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[179,] 27 28
[180,] 34 28
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[182,] 22 29
[183,] 23 29
[184,] 30 29
[185,] 36 29
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[203,] 24 32
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[211,] 25 33
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[215,] 34 33
[216,] 39 33
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[219,] 26 34
[220,] 27 34
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[222,] 33 34
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[226,] 42 34
[227,] 27 35
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[232,] 29 36
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[260,] 34 42
[261,] 35 42
[262,] 41 42
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